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strojnjashka [21]
3 years ago
9

1. Which system has a higher random, average kinetic energy of its atoms, a glass of iced tea or a cup of hot tea?

Physics
1 answer:
natita [175]3 years ago
5 0
The average kinetic energy of the particles is higher in the hot tea, so it also has greater thermal energy then the cold tea.
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A substance has a vapor pressure of 77.86 mm Hg at 318.3 K and a vapor pressure of161.3 mmHg at 340. 7 K. Calculate its heat of
zavuch27 [327]

Explanation:

It is given that,

Initial vapor pressure, P₁ = 77.86 mm

Initial temperature, T₁ = 318.3 K

Final vapor pressure, P₂ = 161.3 mm

Initial temperature, T₂ = 340.7 K

We need to find its heat of vaporization. It can be calculated by using Clausius-Clapeyron equation.

ln(\dfrac{P_2}{P_1})=\dfrac{\Delta_{vap}H}{R}(\dfrac{1}{T_1}-\dfrac{1}{T_2})

\Delta _{vap} H=\dfrac{R\ ln(\dfrac{P_2}{P_1})}{(\dfrac{1}{T_1}-\dfrac{1}{T_2})}

\Delta _{vap} H=\dfrac{0.008 314\ ln(\dfrac{161.3}{77.86})}{(\dfrac{1}{318.3}-\dfrac{1}{340.7})}

\Delta _{vap} H=29.31\ kJ/mol

So, the heat of vaporization of a substance is 29.31 kJ/mol. Hence, this is the required solution.

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3 years ago
A child’s toy rake is held so that its output arm is 0.75 meters. If the mechanical advantage is 0.33, what is
Masja [62]
Input= ?
Output= 0.75
MA= 0.33

So I just kept on Dividing numbers until I was close to "0.33" & I cam up with the answer of .......... 0.25.


So when you divide 0.25 by 0.75 you get the MA of 0.33 
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Which diagram best represents the field around a positively charged particle?
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The last one. Opposites attract while similar ones repulse each other so all forces are pushing them apart
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you (60 kg) are standing in a (500 kg) elevator that is moving upwards from a ground floor on a building what is the power ratin
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Explanation:

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P = 8667 W

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